Comment 0 for bug 1851263

Hi,

I updated from ubuntu 14.04 to 18.04 and installed a custom (old) application.

When starting the application it stop immediately with this error message:
"glibc detected an invalid stdio handle"

This error message was added by commit [1] "libio: Implement vtable verification [BZ #20191]" to fix a security issue [2].

I tested with several Linux distribution (so different libc version) and the application is working fine with Fedora 30 (Glibc 2.29).

There is an interesting patch [3] from Glibc 2.28 which was backported to Glibc 2.27 [4] "libio: Disable vtable validation in case of interposition [BZ #23313]"

But Ubuntu 18.04 is still using an old Glibc 2.27 version (from 02-2018).
Here is the Glibc version used in 18.04:
$ dpkg -s libc6
[...]
Version: 2.27-3ubuntu1

Looking at the changelog, ubuntu updated Glibc 2.27 the 16 Apr 2018 but there is a lot of fix from upstream Glibc 2.27 stable branch. The one I'm looking for was merged the 07-2018.

It would be great if Ubuntu 18.04 can update Glibc to the latest stable version.

Best regards,
Romain

[1] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=db3476aff19b75c4fdefbe65fcd5f0a90588ba51
[2] https://dhavalkapil.com/blogs/FILE-Structure-Exploitation
[3] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=c402355dfa7807b8e0adb27c009135a7e2b9f1b0
[4] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=3bb748257405e94e13de76573a4e9da1cfd961d0